> This is evil ;-)

I agree. It would be better if c++config.h would take compiler and
library configurations into account. For *-*-linux-gnu, c++config.h
should contain fragments like

#ifdef __USE_ISOC99
#define _GLIBCPP_USE_C99 1
#endif

That would remove the need to define _GNU_SOURCE in the command line.

Regards,
Martin


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